What Happens at a Mehndi Ceremony

The mehndi is the night the bride's hands and feet are painted, and in most families it is a party built around the several hours that takes. The groom is often painted too, though rarely for as long.

What the paste is

Mehndi is made from the powdered dry leaves of Lawsonia inermis, the henna plant. The word itself comes from the Sanskrit mendhika, the name of that plant, and it carried into Hindi, Urdu, Punjabi, Gujarati and Bengali more or less unchanged.

The practice is much older than the Indian wedding. It turns up in ancient Babylon and Egypt, and in India there is evidence of it by the fourth century in Deccan cave art. It became widespread around the twelfth century, and the Mughals, ruling from the early 1500s to the mid 1800s, are credited with popularising it.

How the stain actually works

The colour on the night is not the colour. When the dried paste is scraped off, the design is pale to dark orange. It then darkens by oxidation over the following 24 to 72 hours, so a bride who looks at her hands the next morning is not looking at the finished result.

The reddish-brown it settles into lasts one to three weeks. How long depends on the quality of the paste and on where it was applied, because thicker skin takes a darker stain and holds it longer. That is why palms and soles outlast the same design drawn on a forearm.

The timing of the ceremony follows from those numbers. Paste applied on the morning of the wedding would still be orange at the ceremony.

The bit about darkness

There is a well-worn joke that the darker the mehndi comes out, the more your partner loves you. It survives because it is fun, not because it predicts anything. What the depth of the stain actually tracks is the quality of the paste, how long it was left on before scraping, and the thickness of the skin underneath.

Black henna, and what the FDA says about it

Some practitioners add p-phenylenediamine, or PPD, to force the stain black. PPD can cause moderate to severe allergic reactions on skin.

The US Food and Drug Administration is direct about this. The ingredient used to blacken henna, it says, is often a coal-tar hair dye containing PPD, and by law PPD is not permitted in cosmetics intended to be applied to the skin. The agency has received reports of skin injuries from products sold as henna and from products sold as black henna.

Worth reading carefully alongside that: the FDA approves henna only as a hair dye, and not for direct application to skin as in mehndi, which under its rules makes those products adulterated. That is a statement about US regulatory approval rather than a finding that ordinary henna harms people. The agency's practical advice is to try any of it somewhere less conspicuous first.

Where it falls in the week

In the Punjabi running order it comes after the sangeet or dholki and before jaggo, with mayian and the turmeric on the last night.

Weddings are not the only occasion for it. Karwa Chauth fills the same appointment books every October, and the 72 hour rule governs the timing there too.

Which means the hands are painted first and the paste that stains everything yellow comes afterwards.